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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd87b7594b4d0c4fac6b07d3f30afa75e85ddc2ce1ddf68e666c6c2979334f8' 
  AND token = 'xD4JcB0Py4ifD3f5gZksfWFM5SlfJ9fem4ffc2fcfgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}